an interior designer points upward while explaining different lighting options to a homeowner. She gestures toward a elegant chandelier hanging from the ceiling and wall-mounted sconces beside a doorway. The homeowner nods thoughtfully as he examines how each lighting device is wired directly into the electrical system. Warm light glows from each permanently attached fixture, illuminating the room's furniture and decorations. Both people admire how the installed lighting creates perfect ambiance throughout the space. electrical devices that are permanently attached to provide light in a building